KR20120113678A - Method and appratus of configuring donwlink timing reference and transmitting random access response in mobile communication system using carrier aggregation - Google Patents

Method and appratus of configuring donwlink timing reference and transmitting random access response in mobile communication system using carrier aggregation Download PDF

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KR20120113678A
KR20120113678A KR1020120035216A KR20120035216A KR20120113678A KR 20120113678 A KR20120113678 A KR 20120113678A KR 1020120035216 A KR1020120035216 A KR 1020120035216A KR 20120035216 A KR20120035216 A KR 20120035216A KR 20120113678 A KR20120113678 A KR 20120113678A
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timing advance
timing
random access
terminal
base station
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KR1020120035216A
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KR101974987B1 (en
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장재혁
정경인
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삼성전자주식회사
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Priority to PCT/KR2012/002570 priority Critical patent/WO2012138142A2/en
Priority to EP20202919.5A priority patent/EP3826378B1/en
Priority to CN201280027674.XA priority patent/CN103583009B/en
Priority to JP2014503599A priority patent/JP6158165B2/en
Priority to US13/440,195 priority patent/US8964793B2/en
Priority to EP18202354.9A priority patent/EP3454613B1/en
Priority to AU2012240733A priority patent/AU2012240733B2/en
Priority to EP12767346.5A priority patent/EP2695317B1/en
Application filed by 삼성전자주식회사 filed Critical 삼성전자주식회사
Publication of KR20120113678A publication Critical patent/KR20120113678A/en
Priority to US14/731,043 priority patent/US9565711B2/en
Priority to US15/439,512 priority patent/US10602492B2/en
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Publication of KR101974987B1 publication Critical patent/KR101974987B1/en
Priority to US16/826,821 priority patent/US11202285B2/en

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  • Mobile Radio Communication Systems (AREA)

Abstract

PURPOSE: A downlink timing setting and random access response transmitting method and an apparatus thereof in a wireless communication system are provided to control accurate uplink timing without error when uplink timing control information is received. CONSTITUTION: A transceiver(1001) transceives a signal from a base station. A controller(1009) transmits a random access preamble message to the base station. The controller receives the random access preamble message from the base station. The random access preamble message includes a TAC(Timing Advance Command). The TAC is a signal for commanding uplink timing control. [Reference numerals] (1001) Transceiver; (1003) Multiplexing and reverse multiplexing unit; (1005) Upper layer unit; (1007) Control message processor; (1009) Controller; (1011) Carrier wave direct operation processor

Description

반송파 집적 기술을 사용하는 무선통신시스템에서 하향링크 타이밍 설정 및 랜덤 액세스 응답 전송 방법 및 장치 {METHOD AND APPRATUS OF CONFIGURING DONWLINK TIMING REFERENCE AND TRANSMITTING RANDOM ACCESS RESPONSE IN MOBILE COMMUNICATION SYSTEM USING CARRIER AGGREGATION}METHOD AND APPRATUS OF CONFIGURING DONWLINK TIMING REFERENCE AND TRANSMITTING RANDOM ACCESS RESPONSE IN MOBILE COMMUNICATION SYSTEM USING CARRIER AGGREGATION}

본 발명은 무선 통신 시스템에 관한 것으로서, 보다 상세하게는 LTE (Long Term Evolution) 시스템에서, 다수개의 반송파를 동시에 사용하면서, 다수개의 상향링크 타이밍이 사용될 때, 하향링크 타이밍을 설정하고 랜덤 액세스 응답 메시지를 전송하는 방법에 관한 것이다.The present invention relates to a wireless communication system, and more particularly, in a Long Term Evolution (LTE) system, when a plurality of uplink timings are used while using a plurality of carriers simultaneously, a downlink timing is set and a random access response message. It is about how to transmit.

최근 무선 통신 기술은 급격한 발전을 이루었으며, 이에 따라 통신 시스템 기술도 진화를 거듭하였고, 이 가운데 현재 4세대 이동통신 기술로 각광받는 시스템이 LTE 시스템이다. LTE 시스템에서는, 폭증하는 트래픽 수요를 충족시키기 위해 다양한 기술이 도입되었으며, 그 가운데 도입된 기술이 반송파 집적 기술이다. 반송파 집적 기술이란 기존의 통신에서 단말 (UE, 이하 단말이라 칭함) 과 기지국 (eNB, 이하 기지국이라 칭함) 사이에서 하나의 반송파만 사용하던 것을, 주반송파와 하나 혹은 복수개의 부차반송파를 사용하여 부차반송파의 갯수만큼 전송량을 획기적으로 늘릴 수 있다. 한편, LTE에서는 주반송파를 PCell (Primary Cell)이라 하며, 부차반송파(들)을 SCell(s) (Secondary Cell(s))이라 칭한다.Recently, the wireless communication technology has made rapid progress, and accordingly, the communication system technology has evolved. Among these, the LTE system is in the spotlight as the fourth generation mobile communication technology. In the LTE system, various technologies have been introduced to meet exploding traffic demands, and among them, carrier aggregation technology. Carrier aggregation technology means that only one carrier is used between a terminal (UE, hereinafter referred to as UE) and a base station (eNB, hereinafter referred to as eNB) in the conventional communication. The secondary carrier uses a primary carrier and one or more subcarriers. The amount of transmission can be dramatically increased by the number of carriers. Meanwhile, in LTE, a primary carrier is called a PCell (Primary Cell), and subcarrier (s) are called an SCell (s) (Secondary Cell (s)).

한편, 중계기 및 원격 무선 장비 (Remote Radio Head)의 도입 등으로 주반송파와 부차반송파를 사용하는 기지국 장비의 위치가 달라지는 경우, 상향링크의 전송 시점이 달라져야하는 경우가 있다. 예를 들어, 주반송파를 사용하는 기지국 장비와 부차반송파를 사용하는 기지국 장비의 위치가 다른 경우, 단말의 위치에 따라, 보다 멀리 떨어져있는 기지국 장비로의 상향링크 신호를 보다 먼저 전송하여야 하는 등의 문제가 발생한다. On the other hand, when the location of the base station equipment using the primary carrier and the secondary carrier is changed due to the introduction of a repeater and a remote radio head (Remote Radio Head), there is a case that the transmission time of the uplink. For example, when the position of the base station equipment using the primary carrier and the base station equipment using the secondary carrier is different, according to the position of the terminal, the uplink signal to the farther base station equipment should be transmitted earlier, etc. A problem arises.

이러한 경우, 즉, 복수 개의 상향링크 타이밍이 존재하는 경우, 각각의 상향링크 타이밍에 대해 기준 신호가 필요하다. 이에 따라 어떠한 셀로부터의 하향링크 신호를 하향링크 타이밍 기준 신호 (Downlink Timing Reference)로 설정해야 하는지에 대한 정의가 필요하다. In this case, that is, when there are a plurality of uplink timings, a reference signal is required for each uplink timing. Accordingly, it is necessary to define which cell should be set as a downlink timing reference signal (Downlink Timing Reference).

뿐만 아니라, 실제 상향링크 타이밍을 위해 랜덤 엑세스를 수행할 때, 단말이 랜덤 엑세스 프리앰블을 전송한 이후, 기지국이 상향링크 타이밍 정보를 포함한 랜덤 액세스 응답 메시지를 전송할 때, 어떠한 반송파로부터 수신한 프리앰블인지에 대한 정보가 현재는 없어, 이를 명확히 할 필요가 있다.In addition, when performing random access for the actual uplink timing, after the UE transmits the random access preamble, when the base station transmits a random access response message including the uplink timing information, which carrier is received from which preamble There is no information available at this time, so it needs to be clarified.

본 발명은 상기와 같은 문제점을 해결하기 위해 창안된 것으로, 본 발명의 목적은 무선 이동 통신 시스템에서 반송파 집적 기술을 사용하는 경우, 복수 개의 상향링크 타이밍 관리를 할 때, 어떠한 하향링크 신호를 하향링크 타이밍 기준신호로 삼는지와, 랜덤 액세스 과정에서 기지국이 상향링크 타이밍 조정을 위해 타이밍 어드밴스 정보를 내려줄 때, 어떠한 셀을 기준으로 잡은 타이밍에 대한 정보인지를 포함하는 메시지를 전송하는 방법을 제공한다.The present invention was devised to solve the above problems, and an object of the present invention is to downlink any downlink signal when managing a plurality of uplink timings when using carrier aggregation technology in a wireless mobile communication system. Provides a method for transmitting a message including the timing reference signal, and which cell information is the timing of the base station when the base station gives the timing advance information for uplink timing adjustment in a random access process. .

구체적으로, 본 발명은 무선통신시스템에서 반송파 집적(Carrier Aggregation) 기술을 사용하는 경우, 반송파 그룹별 별도의 상향링크 전송 타이밍을 가지는 경우, 각각의 반송파 그룹에 대한 하향링크 기준셀을 설정하는 방법을 정의한다. 또한, 특정 반송파 그룹에 대한 상향링크 전송 타이밍을 맞추기 위해 단말이 랜덤 엑세스를 시도할 때, 기지국에서 이에 대한 응답 메시지를 정의한다.In detail, the present invention relates to a method of configuring a downlink reference cell for each carrier group when using a carrier aggregation technique in a wireless communication system and having a separate uplink transmission timing for each carrier group. define. In addition, when the UE attempts random access to match uplink transmission timing for a specific carrier group, the BS defines a response message.

상기와 같은 문제점을 해결하기 위한 본 발명의 단말의 타이밍 조절 방법은,기지국에 랜덤 엑세스 프리앰블을 전송하는 단계; 및 상향링크 타이밍 조절을 명령하는 타이밍 어드밴스 커멘드(Timing Advance Command, TAC)를 포함하는 랜덤 엑세스 응답 메시지를 상기 기지국으로부터 수신하는 단계를 포함하며, 상기 랜덤 엑세스 응답 메시지는, 상기 타이밍 어드밴스 커멘드를 적용할 타이밍 어드밴스 그룹 정보(Timing Advance Group, TAG)를 더 포함하는 것을 특징으로 한다. The timing adjustment method of the terminal of the present invention for solving the above problems comprises the steps of: transmitting a random access preamble to the base station; And receiving a random access response message including a timing advance command (TAC) for commanding uplink timing adjustment from the base station, wherein the random access response message is configured to apply the timing advance command. The apparatus may further include timing advance group information (Timing Advance Group, TAG).

나아가, 본 발명의 기지국의 타이밍 조절 방법은, 단말로부터 랜덤 엑세스 프리앰블을 수신하는 단계; 및 상향링크 타이밍 조절을 명령하는 타이밍 어드밴스 커멘드(Timing Advance Command, TAC)를 포함하는 랜덤 엑세스 응답 메시지를 상기 단말에게 전송하는 단계를 포함하며, 상기 랜덤 엑세스 응답 메시지는, 상기 타이밍 어드밴스 커멘드를 적용할 타이밍 어드밴스 그룹 정보(Timing Advance Group, TAG)를 더 포함하는 것을 특징으로 한다. Further, the timing adjustment method of the base station of the present invention, the step of receiving a random access preamble from the terminal; And transmitting a random access response message including a timing advance command (TAC) for commanding uplink timing adjustment to the terminal, wherein the random access response message is configured to apply the timing advance command. The apparatus may further include timing advance group information (Timing Advance Group, TAG).

한편 본 발명의 타이밍을 조절하는 단말은, 기지국과 신호를 송수신하는 송수신기; 및 기지국에 랜덤 엑세스 프리앰블을 전송하고, 상향링크 타이밍 조절을 명령하는 타이밍 어드밴스 커멘드(Timing Advance Command, TAC)를 포함하는 랜덤 엑세스 응답 메시지를 상기 기지국으로부터 수신하도록 제어하는 제어부를 포함하며, 상기 랜덤 엑세스 응답 메시지는, 상기 타이밍 어드밴스 커멘드를 적용할 타이밍 어드밴스 그룹 정보(Timing Advance Group, TAG)를 더 포함하는 것을 특징으로 한다. On the other hand, the terminal for adjusting the timing of the present invention, the base station and the transceiver for transmitting and receiving a signal; And a control unit for transmitting a random access preamble to a base station and controlling to receive a random access response message including a timing advance command (TAC) for commanding uplink timing adjustment from the base station. The response message may further include timing advance group information (TAG) to which the timing advance command is applied.

그리고, 본 발명의 타이밍을 조절하는 기지국은 단말과 신호를 송수신하는 송수신기; 및 단말로부터 랜덤 엑세스 프리앰블을 수신하고, 상향링크 타이밍 조절을 명령하는 타이밍 어드밴스 커멘드(Timing Advance Command, TAC)를 포함하는 랜덤 엑세스 응답 메시지를 상기 단말에게 전송하도록 제어하는 제어부를 포함하며, 상기 랜덤 엑세스 응답 메시지는, 상기 타이밍 어드밴스 커멘드를 적용할 타이밍 어드밴스 그룹 정보(Timing Advance Group, TAG)를 더 포함하는 것을 특징으로 한다.And, the base station for adjusting the timing of the present invention includes a transceiver for transmitting and receiving a signal with the terminal; And a controller configured to receive a random access preamble from a terminal and to transmit a random access response message including a timing advance command (TAC) to command an uplink timing adjustment to the terminal. The response message may further include timing advance group information (TAG) to which the timing advance command is applied.

제안하는 방법을 이용하면, 복수 개의 상향링크 타이밍이 존재할 때, 어떠한 하향링크 신호를 기준으로 설정하면 되는지에 대해 명확해지며, 상향링크 타이밍 조정 정보를 수신하는 과정에서도 오류없이 정확한 상향링크 타이밍을 조정할 수 있다.Using the proposed method, when there is a plurality of uplink timings, it becomes clear which downlink signal should be set as a reference, and adjusts the uplink timing without error even in the process of receiving uplink timing adjustment information. Can be.

도 1은 본 발명이 적용되는 LTE 시스템의 구조를 도시하는 도면
도 2는 본 발명이 적용되는 LTE 시스템에서 무선 프로토콜 구조를 나타낸 도면
도 3은 단말에서 반송파 집적을 설명하기 위한 도면
도 4는 업링크 타이밍싱크절차의 필요성과 역할
도 5는 반송파 집적을 사용하는 경우에, 주반송파와 부차반송파간의 장치 위치가 다른 경우를 설명하기 위한 도면
도 6은 본 발명에서 제안하는 기지국과 단말기 사이의 시그널링 플로우와 단말기 동작에 대한 도면
도 7은 본 발명을 적용하였을 때의 단말기 동작 순서 도면
도 8은 본 발명을 적용하였을 때의 기지국 동작 순서 도면
도 9는 제안하는 RAR과 TAC MAC CE 포맷 도면
도 10은 본 발명을 적용한 단말의 장치도면
도 11은 본 발명을 적용한 기지국의 장치도면1 is a diagram illustrating a structure of an LTE system to which the present invention is applied.
2 is a view showing a radio protocol structure in an LTE system to which the present invention is applied
3 is a diagram for explaining carrier aggregation in a terminal;
4 shows the necessity and role of the uplink timing sink procedure.
FIG. 5 is a diagram for explaining a case where device positions between a main carrier and a subcarrier are different when carrier aggregation is used; FIG.
6 is a diagram illustrating a signaling flow and a terminal operation between a base station and a terminal proposed in the present invention.
7 is a flowchart illustrating a terminal operation when the present invention is applied.
8 is a flowchart illustrating a base station operation when the present invention is applied.
9 is a diagram of a proposed RAR and TAC MAC CE format
10 is a device diagram of a terminal to which the present invention is applied
11 is a device diagram of a base station to which the present invention is applied.

하기에서 본 발명을 설명함에 있어 관련된 공지 기능 또는 구성에 대한 구체적인 설명이 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 경우에는 그 상세한 설명을 생략할 것이다. 이하 첨부된 도면을 참조하여 본 발명의 실시 예를 설명하기로 한다.In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

본 발명은 다중 반송파들이 집적된 단말이 부차반송파를 활성화하는 방법 및 장치에 관한 것이다. The present invention relates to a method and apparatus for activating a subcarrier by a terminal having multiple carriers integrated thereon.

도 1은 본 발명이 적용되는 LTE 시스템의 구조를 도시하는 도면이다. 1 is a diagram illustrating a structure of an LTE system to which the present invention is applied.

도 1을 참조하면, 도시한 바와 같이 LTE 시스템의 무선 액세스 네트워크는 차세대 기지국(Evolved Node B, 이하 ENB, Node B 또는 기지국)(105, 110, 115, 120)과 MME (125, Mobility Management Entity) 및 S-GW(130, Serving-Gateway)로 구성된다. 사용자 단말(User Equipment, 이하 UE 또는 단말)(135)은 ENB(105 ~ 120) 및 S-GW(130)를 통해 외부 네트워크에 접속한다.Referring to FIG. 1, as shown, a radio access network of an LTE system includes a next-generation base station (Evolved Node B, ENB, Node B, or base station) 105, 110, 115, and 120 and an MME 125. And S-GW 130 (Serving-Gateway). The user equipment (hereinafter referred to as UE or terminal) 135 accesses an external network through the ENBs 105 to 120 and the S-GW 130.

도 1에서 ENB(105 ~ 120)는 UMTS 시스템의 기존 노드 B에 대응된다. ENB는 UE(135)와 무선 채널로 연결되며 기존 노드 B 보다 복잡한 역할을 수행한다. LTE 시스템에서는 인터넷 프로토콜을 통한 VoIP(Voice over IP)와 같은 실시간 서비스를 비롯한 모든 사용자 트래픽이 공용 채널(shared channel)을 통해 서비스 되므로, UE들의 버퍼 상태, 가용 전송 전력 상태, 채널 상태 등의 상태 정보를 취합해서 스케줄링을 하는 장치가 필요하며, 이를 ENB(105 ~ 120)가 담당한다. In FIG. 1, the ENBs 105 to 120 correspond to existing Node Bs of the UMTS system. The ENB is connected to the UE 135 by a radio channel and performs a more complicated role than the existing Node B. In LTE system, all user traffic, including real-time services such as Voice over IP (VoIP) over the Internet protocol, is serviced through a shared channel, so information on the status of buffers, available transmit power, and channel status of UEs is available. It is necessary to have a device for scheduling the collection of this, ENB (105 ~ 120) is in charge.

하나의 ENB는 통상 다수의 셀들을 제어한다. 예컨대, 100 Mbps의 전송 속도를 구현하기 위해서 LTE 시스템은 예컨대, 20 MHz 대역폭에서 직교 주파수 분할 다중 방식(Orthogonal Frequency Division Multiplexing, 이하 OFDM이라 한다)을 무선 접속 기술로 사용한다. 또한 단말의 채널 상태에 맞춰 변조 방식(modulation scheme)과 채널 코딩률(channel coding rate)을 결정하는 적응 변조 코딩(Adaptive Modulation & Coding, 이하 AMC라 한다) 방식을 적용한다. One ENB typically controls multiple cells. For example, in order to realize a transmission rate of 100 Mbps, the LTE system uses orthogonal frequency division multiplexing (hereinafter, referred to as OFDM) in a 20 MHz bandwidth as a radio access technology. In addition, an adaptive modulation & coding (AMC) scheme that determines a modulation scheme and a channel coding rate according to the channel state of the terminal is applied.

S-GW(130)는 데이터 베어러를 제공하는 장치이며, MME(125)의 제어에 따라서 데이터 베어러를 생성하거나 제거한다. MME는 단말에 대한 이동성 관리 기능은 물론 각종 제어 기능을 담당하는 장치로 다수의 기지국 들과 연결된다.
The S-GW 130 is a device that provides a data bearer, and generates or removes a data bearer under the control of the MME 125. The MME is a device that is in charge of various control functions as well as mobility management function for the terminal and is connected to a plurality of base stations.

도 2는 본 발명이 적용되는 LTE 시스템에서 무선 프로토콜 구조를 나타낸 도면이다. 2 is a diagram illustrating a radio protocol structure in an LTE system to which the present invention is applied.

도 2를 참조하면, LTE 시스템의 무선 프로토콜은 단말과 ENB에서 각각 PDCP(Packet Data Convergence Protocol 205, 240), RLC(Radio Link Control 210, 235), MAC (Medium Access Control 215,230)으로 이루어진다. Referring to FIG. 2, a wireless protocol of an LTE system includes packet data convergence protocols 205 and 240 (PDCP), radio link control 210 and 235 (RMC), and medium access control 215 and 230 (MAC) in a terminal and an ENB, respectively.

PDCP(Packet Data Convergence Protocol)(205, 240)는 IP 헤더 압축/복원 등의 동작을 담당하고, 무선 링크 제어(Radio Link Control, 이하 RLC라고 한다)(210, 235)는 PDCP PDU(Packet Data Unit)를 적절한 크기로 재구성해서 ARQ (Automatic Repeat reQuest) 동작 등을 수행한다. ARQ 동작은 송신단에서 전송한 패킷이 수신단에 제대로 전달되었는지 확인하여, 만약 잘못 전달되었을 경우 재전송을 하는 일련의 동작을 뜻한다. The PDCP (Packet Data Convergence Protocol) 205, 240 is responsible for operations such as IP header compression / restore, and the radio link control (hereinafter referred to as RLC) 210, 235 is a PDCP PDU (Packet Data Unit). ) To the appropriate size to perform ARQ (Automatic Repeat reQuest) operation. The ARQ operation refers to a series of operations that check whether a packet transmitted from a transmitting end is properly delivered to a receiving end, and if retransmitted if wrong.

MAC(215,230)은 한 단말에 구성된 여러 RLC 계층 장치들과 연결되며, RLC PDU들을 MAC PDU에 다중화하고 MAC PDU로부터 RLC PDU들을 역다중화하는 동작을 수행한다. The MACs 215 and 230 are connected to several RLC layer devices configured in one terminal, and multiplex RLC PDUs to MAC PDUs and demultiplex RLC PDUs from MAC PDUs.

물리 계층(220, 225)은 상위 계층 데이터를 채널 코딩 및 변조하고, OFDM 심벌로 만들어서 무선 채널로 전송하거나, 무선 채널을 통해 수신한 OFDM 심벌을 복조하고 채널 디코딩해서 상위 계층으로 전달하는 동작을 한다. 또한 물리 계층에서도 추가적인 오류 정정을 위해, HARQ (Hybrid ARQ) 를 사용하고 있으며, 수신단에서는 송신단에서 전송한 패킷의 수신여부를 1 비트로 전송한다. 이를 HARQ ACK/NACK 정보라 한다.
The physical layers 220 and 225 channel-code and modulate higher layer data, make an OFDM symbol, and transmit it to a wireless channel, or demodulate, channel decode, and transmit the received OFDM symbol through a wireless channel to a higher layer. . In addition, the physical layer uses HARQ (Hybrid ARQ) for additional error correction, and the receiving end transmits the reception of the packet transmitted by the transmitting end as 1 bit. This is called HARQ ACK / NACK information.

도 3은 단말에서 반송파 집적을 설명하기 위한 도면이다.3 is a diagram for describing carrier aggregation in a terminal.

도 3을 참조하면, 하나의 기지국에서는 일반적으로 여러 주파수 대역에 걸쳐서 다중 반송파들이 송출되고 수신된다. 예를 들어 기지국(305)에서 중심 주파수가 f1인 반송파(315)와 중심 주파수가 f3(310)인 반송파가 송출될 때, 종래에는 하나의 단말이 상기 두 개의 반송파 중 하나의 반송파를 이용해서 데이터를 송수신하였다. 그러나 반송파 집적 능력을 가지고 있는 단말은 동시에 여러 개의 반송파로부터 데이터를 송수신할 수 있다. 기지국(305)은 반송파 집적 능력을 가지고 있는 단말(330)에 대해서는 상황에 따라 더 많은 반송파를 할당함으로써 상기 단말(330)의 전송 속도를 높일 수 있다. Referring to FIG. 3, in one base station, multiple carriers are generally transmitted and received over several frequency bands. For example, when a carrier 315 having a center frequency of f1 and a carrier having a center frequency of f3 310 are transmitted from a base station 305, one terminal uses data from one of the two carriers. Transmitted and received. However, a terminal having carrier aggregation capability may transmit and receive data from multiple carriers at the same time. The base station 305 may increase the transmission speed of the terminal 330 by allocating more carriers to the terminal 330 having the carrier aggregation capability according to the situation.

전통적인 의미로 하나의 기지국에서 송출되고 수신되는 하나의 순방향 반송파와 하나의 역방향 반송파가 하나의 셀을 구성한다고 할 때, 반송파 집적이란 단말이 동시에 여러 개의 셀을 통해서 데이터를 송수신하는 것으로 이해될 수도 있을 것이다. 이를 통해 최대 전송 속도는 집적되는 반송파의 수에 비례해서 증가된다. In a conventional sense, when one forward carrier and one backward carrier transmitted and received by one base station constitute one cell, carrier aggregation may be understood as a terminal transmitting and receiving data through multiple cells at the same time. will be. Through this, the maximum transmission rate is increased in proportion to the number of carriers integrated.

이하 본 발명을 설명함에 있어서 단말이 임의의 순방향 반송파를 통해 데이터를 수신하거나 임의의 역방향 반송파를 통해 데이터를 전송한다는 것은 상기 반송파를 특징짓는 중심 주파수와 주파수 대역에 대응되는 셀에서 제공하는 제어 채널과 데이터 채널을 이용해서 데이터를 송수신한다는 것과 동일한 의미를 가진다. 또한 이하 본 발명의 실시 예는 설명의 편의를 위해 LTE 시스템을 가정하여 설명될 것이나, 본 발명은 반송파 집적을 지원하는 각종 무선 통신 시스템에 적용될 수 있다.In the following description of the present invention, the UE receiving data through an arbitrary forward carrier or transmitting data through an arbitrary backward carrier means that a control channel provided by a cell corresponding to a center frequency and a frequency band that characterizes the carrier is provided. It has the same meaning as transmitting and receiving data using the data channel. In addition, embodiments of the present invention will be described assuming an LTE system for convenience of description, but the present invention can be applied to various wireless communication systems supporting carrier aggregation.

도 4는 OFDM 다중화방식을 적용한 3GPP LTE 시스템에서의 업링크 타이밍싱크절차의 필요성과 역할을 나타낸다. 4 illustrates the necessity and role of an uplink timing sync procedure in a 3GPP LTE system using an OFDM multiplexing scheme.

UE1(이하 단말기1이라고 칭함)은 E-NB에 가까이 위치하고 있는 단말기를 나타내며, UE2(이하 단말기2라고 칭함)는 E-NB에서 멀리 떨어져 있는 단말기를 나타낸다. T_pro1은 상기 단말기1까지의 라디오전송에 있어서의 전파지연시간(Propagation delay time)을 나타내며, T_pro2는 상기 단말기2까지의 라디오전송에 있어서의 전파지연시간을 나타낸다. UE1 (hereinafter referred to as terminal 1) indicates a terminal located near the E-NB, and UE2 (hereinafter referred to as terminal 2) indicates a terminal far from the E-NB. T_pro1 represents a propagation delay time for radio transmission to the terminal 1, and T_pro2 represents a propagation delay time for radio transmission to the terminal 2.

단말기1이 단말기2에 비해 E-NB에 가까운 곳에 위치하고 있기 때문에 상대적으로 작은 전파지연시간을 가짐을 알 수 있다. (도4에서 T_pro1은 0.333us, T_pro2는 3.33us를 보임)Since the terminal 1 is located closer to the E-NB than the terminal 2, it has a relatively small propagation delay time. (T_pro1 shows 0.333us and T_pro2 shows 3.33us in FIG. 4)

도 4의 E-NB의 한 셀에서 상기 단말기1과 단말기2를 파워온(Power on)을 할 때나 상기 단말기1과 단말기2가 휴면 (Idle, 아이들) 모드에 있다고 할 때, 상기 단말기1의 업링크 타이밍싱크와 단말기2의 업링크 타이밍싱크 그리고 E-NB가 탐지(Detection)하는 셀내 단말기들의 업링크 타이밍싱크가 맞지 않다. When the terminal 1 and the terminal 2 are powered on in one cell of the E-NB of FIG. 4 or when the terminal 1 and the terminal 2 are in the idle (idle) mode, the terminal 1 is turned up. The link timing sink, the uplink timing sink of the terminal 2, and the uplink timing sink of the terminals in the cell detected by the E-NB are not matched.

401은 단말기1의 OFDM 심벌(Symbol) 업링크 전송에 대한 타이밍싱크를 나타내며, 403은 단말기2의 OFDM 심벌 업링크 전송에 대한 타이밍싱크를 나타낸다. 단말기1과 단말기2의 업링크 전송의 전파지연시간을 고려하면 상기 업링크 OFDM 심벌을 수신하는 E-NB에서의 타이밍은 407,408과 같다. 401 indicates a timing sink for the OFDM symbol uplink transmission of the terminal 1, and 403 indicates a timing sink for the OFDM symbol uplink transmission of the terminal 2. Considering the propagation delay time of the uplink transmissions of the terminal 1 and the terminal 2, the timing in the E-NB receiving the uplink OFDM symbol is equal to 407,408.

즉, 401의 단말기1의 업링크심벌은 전파지연시간을 가지고 407의 타이밍을 가지고 E-NB에서 수신되며, 403의 단말기2의 업링크심벌은 전파지연시간을 가지고 409의 타이밍을 가지고 E-NB에서 수신된다. 도 4에서 보이는 것과 같이, 407, 409는 아직 단말기1, 단말기2에 대한 업링크 타이밍싱크를 맞추기 전이기 때문에, E-NB가 업링크 OFDM 심벌을 수신하여 디코딩하는 시작 타이밍인 405와 단말기1로부터의 OFDM 심벌을 수신하는 타이밍인 407, 그리고 단말기2로부터의 OFDM 심벌을 수신하는 타이밍인 409가 각각 틀림을 확인할 수 있다. That is, the uplink symbol of the terminal 1 of the 401 has a propagation delay time and is received from the E-NB with the timing of 407, and the uplink symbol of the terminal 2 of the 403 has the timing of 409 with the propagation delay time of the E-NB. Is received from. As shown in Fig. 4, since 407 and 409 are still before the uplink timing sinks for the terminal 1 and the terminal 2, the E-NB receives the uplink OFDM symbols and decodes the starting timing of the 405 and the terminal 1. 407, which is a timing for receiving an OFDM symbol, and 409, which is a timing for receiving an OFDM symbol from a terminal 2, can be confirmed to be incorrect.

그러므로, 단말기1과 단말기2로부터 전송되는 상향링크 심벌은 직교성(Orthogonality)을 가지지 않으므로 서로 간섭(Interference)으로 작용하며, E-NB는 상기 간섭과 405와 어긋나는 407, 409의 업링크 심벌 수신 타이밍으로 인해 401, 403의 단말기1, 단말기2로부터 전송되는 업링크심벌을 성공적으로 디코딩(Decoding)할 수 없는 문제가 발생한다. Therefore, since the uplink symbols transmitted from the terminal 1 and the terminal 2 do not have orthogonality, they act as interference with each other, and the E-NB has an uplink symbol reception timing of 407 and 409 that deviates from the interference and 405. This causes a problem in that the uplink symbols transmitted from the terminal 1 and the terminal 2 of the 401 and 403 cannot be decoded successfully.

업링크 타이밍 싱크 절차는 단말기1, 단말기2, E-NB의 업링크심벌 수신타이밍을 동일하게 맞추는 과정이며, 상기 업링크 타이밍싱크프로시져를 끝내면 411, 413, 415와 같이 E-NB과 업링크 OFDM 심벌을 수신하여 디코딩하는 시작 타이밍, 단말기1에서부터의 업링크 OFDM 심벌을 수신하는 타이밍, 단말기2에서부터의 업링크 OFDM 심벌을 수신하는 타이밍을 맞추게 된다. The uplink timing sync procedure is a process of matching the uplink symbol reception timing of the terminal 1, the terminal 2, and the E-NB equally. When the uplink timing sink procedure is finished, the uplink timing sync procedure is performed as shown in 411, 413, and 415. A timing of receiving and decoding symbols, timing of receiving an uplink OFDM symbol from terminal 1, and timing of receiving an uplink OFDM symbol from terminal 2 are adjusted.

업링크 타이밍 싱크 절차에서, E-NB는 상기 단말기들에게 타이밍 어드밴스 (Timing Advance, 이하 TA 라 칭함) 정보를 전송하여 얼마만큼 타이밍을 조절하여야 하는지에 대한 정보를 내려준다. In the uplink timing sync procedure, the E-NB transmits timing advance (Timing Advance) information to the terminals to inform the terminal how much timing should be adjusted.

이때 TA 정보는, E-NB가 타이밍 어드밴스 커맨드 MAC Control Element (Timing Advance Commance MAC Control Element, 이하 TAC MAC CE라 칭함)를 통해 전송하거나, 혹은 초기 액세스를 위해 단말기가 전송한 랜덤 엑세스 프리앰블에 대한 응답 메시지 (Random Access Response, 이하 RAR이라 칭함)를 통해서도 전송할 수 있다. In this case, the TA information is transmitted by the E-NB through a timing advance command MAC control element (hereinafter referred to as a TAC MAC CE) or a random access preamble transmitted by the terminal for initial access. It can also be transmitted through a message (Random Access Response, hereinafter referred to as RAR).

단말기는 상기 TA 정보로 상향링크 전송 시점을 조절할 수 있다. 상기 TA 정보를 수신한 단말은 타임 정렬 타이머 (timeAlignmentTimer, 이하 TAT라 칭함)를 시작하고, TA 정보를 이후에 추가 수신하는 경우 등에 상기 TAT를 재시작하고, 상기 TAT가 일정 시간이 지나 만료된 경우, 더 이상 기지국으로부터 받은 TA 정보가 유효하지 않다고 판단하여 해당 E-NB와의 상향링크 통신을 중단한다. The terminal may adjust an uplink transmission time using the TA information. The terminal receiving the TA information starts a time alignment timer (timeAlignmentTimer, hereinafter referred to as TAT), restarts the TAT when additionally receiving TA information later, and when the TAT expires after a predetermined time, It is determined that the TA information received from the base station is no longer valid and stops uplink communication with the corresponding E-NB.

상기와 같은 방법으로 상기 타이밍들을 맞추게 되면, 단말기1과 단말기2로부터 전송되는 업링크 심벌은 직교성을 유지할 수 있으며, E-NB는 401, 403의 단말기1, 단말기2로부터 전송되는 업링크심벌을 성공적으로 디코딩할 수 있다.
When the timings are adjusted in the above manner, the uplink symbols transmitted from the terminal 1 and the terminal 2 can maintain orthogonality, and the E-NB successfully performs the uplink symbols transmitted from the terminal 1 and the terminal 2 of the 401 and 403. Can be decoded.

도 5는 반송파 집적을 사용하는 경우에, 주반송파와 부차반송파간의 장치 위치가 다른 경우를 설명하기 위한 도면이다. FIG. 5 is a diagram for explaining a case where device positions between a main carrier and a subcarrier are different when carrier aggregation is used.

도 5에서 F1 주파수 대역 (505)을 사용하는 매크로 기지국 (501)의 주위에 F2 주파수 대역 (507)을 사용하는 원격 무선 장비 (Remote Radio Head, RRH) (503) 들이 분포해 있다. 만약 단말이 매크로 기지국과 원격 무선 장비를 동시에 사용하는 경우, 또한, 원격 무선 장비 근처에 위치할 경우, 원격 무선 장비로 신호를 쏠 때는, 거리가 가깝기 때문에, 조금 늦게 쏘아도 신호가 적절한 시점에 도달할 수가 있으나, 매크로 기지국으로 신호를 쏠 때는, 거리가 멀기 때문에, 조금 일찍 쏘아야 신호가 적절한 시점에 도달할 수 있다. 즉, 한 단말 내에서, 반송파 집적을 사용하는 경우에, 도 4에서 설명한 것과 같은 복수 개의 상향링크 타이밍을 맞추어야 한다.In FIG. 5, remote radio heads (RRHs) 503 using the F2 frequency band 507 are distributed around the macro base station 501 using the F1 frequency band 505. If the terminal is using the macro base station and the remote radio at the same time, and also located near the remote radio, when shooting the signal with the remote radio, the distance is close, so even if you shoot a little later, the signal reaches the appropriate point Although it is possible to shoot a signal with a macro base station, since the distance is far, it is necessary to shoot a little early so that the signal can reach an appropriate point in time. That is, in case of using carrier aggregation within one terminal, a plurality of uplink timings as described in FIG. 4 must be adjusted.

이를 위해 본 발명에서 기지국은 비슷한 상향링크 타이밍을 가지는 반송파들에 대해 그룹으로 묶어서 관리하도록 한다. 이를 타이밍 어드밴스 그룹 (Timing Advance Group, 이하 TAG라 칭함)이라 한다.To this end, in the present invention, the base station groups and manages carriers having similar uplink timing in groups. This is called a timing advance group (hereinafter, referred to as a TAG).

즉, 예를 들어, 하나의 PCell과 세 개의 SCell A, B, C가 존재할 경우에, PCell과 SCell A가 비슷한 상향링크 타이밍을 가질 때, 이를 하나의 그룹 1로, SCell B와 SCell C를 그룹 2로 묶어서 관리할 수 있다. That is, for example, when one PCell and three SCells A, B, and C exist, when the PCell and SCell A have similar uplink timing, they are grouped into one group 1, and SCell B and SCell C are grouped together. Can be bundled and managed by 2.

즉, 그룹 1에 대해 기지국에서 TAC MAC CE를 전송하여 상향링크 타이밍을 조절을 명령하면, 단말은 해당 PCell과 SCell A에 대해 모두, 상기 TAC MAC CE에 포함된 정보에 따라 상향링크 타이밍을 조절한다. 한편 PCell이 포함된 TAG을 PTAG이라 칭하고, SCell이 포함된 TAG를 STAG이라 칭하도록 한다.That is, when the base station transmits a TAC MAC CE to the group 1 to command the uplink timing, the terminal adjusts the uplink timing according to the information contained in the TAC MAC CE for both the PCell and SCell A. . Meanwhile, a TAG including a PCell is called a PTAG, and a TAG including a SCell is called an STAG.

상기와 같이 복수 개의 상향링크 타이밍을 맞출 때, 각각의 상향링크 타이밍정보, 즉 TA 정보에 대해 기준 (reference) 하향링크 셀을 정할 필요가 있다. 예를 들어, 도 5에서 단말이 매크로 기지국과 원격 무선 장비를 동시에 사용하는 경우, 또한, 원격 무선 장비 근처에 위치할 경우, 원격 무선 장비에서부터 오는 하향링크 신호는, 매크로 기지국에서부터 오는 하향링크 신호에 비해 상대적으로 빨리 도착을 하게 된다. When the plurality of uplink timings are set as described above, a reference downlink cell needs to be determined for each uplink timing information, that is, TA information. For example, in FIG. 5, when the terminal uses the macro base station and the remote radio at the same time, and is also located near the remote radio, the downlink signal from the remote radio is transmitted to the downlink signal from the macro base station. You arrive relatively quickly.

이에 기지국에서 단말의 상향링크 타이밍을 조절하기 위해 TA 정보를 전송한 경우, 어떠한 신호를 기준으로 타이밍을 조절해야하는지를 정의할 필요가 있다. 즉, STAG에 속한 SCell의 상향링크 전송 시, 기지국으로부터 TA 정보를 수신하였을 때, 상기 TA 정보의 기준이 되는 하향링크 타이밍 기준 셀을 어떻게 선정/설정하여 업링크 전송 타이밍을 조절할 것인가의 문제가 발생한다. Accordingly, when TA information is transmitted in order to adjust uplink timing of the UE, it is necessary to define which signal should be adjusted based on the signal. That is, when uplink transmission of the SCell belonging to the STAG, when receiving the TA information from the base station, there is a problem of how to select / set the downlink timing reference cell that is the reference of the TA information to adjust the uplink transmission timing do.

뿐만 아니라 상기 TA 정보를 수신하였을 때, 해당 TA 정보를 어떤 TAG의 상향링크 전송에 적용할 것인지에 대한 문제도 발생한다. 그리고, 상기에 든 예와 같이 복수 개의 TAG를 가져서 복수개의 TA 설정 정보가 필요한 경우, 각 TAG 별로 나누어서 일일이 하나씩 설정하게 되면, TAG 개수가 많을 경우에 TA 정보 전송이 늦어지는 TAG에 대해서는 상향링크 전송까지의 전송 지연이 클 수 있다는 문제점이 발생한다.In addition, when receiving the TA information, a problem arises as to which TAG to apply the TA information to the uplink transmission. In addition, when a plurality of TA configuration information is required by having a plurality of TAGs as in the above-described example, when each of the TAGs is set one by one, the uplink transmission is performed for the TAG that delays TA information transmission when the number of TAGs is large. There is a problem that the transmission delay up to may be large.

상기 문제점들을 해결하기 위한 발명 내용이 도 6에 기술되어 있으며, 도 6은 본 발명에서 제안하는 기지국과 단말기 사이의 시그널링 플로우와 단말기 동작에 대한 도면이다.The present invention for solving the above problems is described in FIG. 6, which is a diagram illustrating a signaling flow and a terminal operation between a base station and a terminal proposed by the present invention.

본 예시 도면에서, 기지국 (603, 605, 607) 은 3개의 셀을 갖고 있으며, 단말은 (607)에 접속되어 있는 상태이다. 즉, (607) 기지국이 단말의 PCell이다. (PCell은 상기 설명한 바와 같이 상기 단말의 주반송파를 뜻한다) 기지국은 단말이 반송파 집적이 가능하다는 사실을 알고, 상기 단말에게 같은 STAG 1에 속하는 SCell 1 (603)과 SCell 2 (605)를 무선자원제어 (Radio Resource Control, 이하 RRC라 칭함) 계층의 메시지를 사용하여 상기 단말에게 설정한 SCell 들 (본 예시 도면에서는 SCell 1과 SCell 2)의 정보와 STAG 설정 정보 (본 예시 도면에서는 SCell 1과 SCell 2를 묶어서 STAG 1으로 설정), 및 TAG의 TAT 값을 설정한다 (611). In this example figure, the base stations 603, 605, and 607 have three cells, and the terminal is connected to 607. FIG. That is, (607) the base station is the PCell of the terminal. (PCell refers to the primary carrier of the terminal as described above) The base station knows that the terminal is capable of carrier aggregation, the base station wirelessly SCell 1 (603) and SCell 2 (605) belonging to the same STAG 1 to the terminal Information of SCells (SCell 1 and SCell 2 in this example drawing) and STAG configuration information (SCell 1 and SCell 1 in this example drawing) configured to the terminal using a message of a radio resource control (hereinafter referred to as RRC) layer SCell 2 is bundled and set to STAG 1), and the TAT value of the TAG is set (611).

상기 RRC 계층의 메시지는 RRCConnectionReconfiguration 메시지를 사용할 수 있다. 또한, 본 예시 도면에서, 상기 RRC 계층의 메시지 내용에 SCell 1의 랜덤액세스채널 (Random Access Channel, 이하 RACH라 칭함) 설정 정보가 포함되어 있으며, SCell 2에 대해서는 RACH 설정 정보를 포함하지 않을 수 있다. The RRC layer message may use an RRCConnectionReconfiguration message. In addition, in the present example figure, the RRC layer message content includes random access channel configuration information (hereinafter referred to as RACH) of SCell 1, and SCell 2 may not include RACH configuration information. .

기지국이 차후 SCell 1의 랜덤액세스채널을 통해 랜덤액세스 프리엠블 전송을 단말기에게 명령하면 상기 단말기는 상기 SCell 1에 포함되어 있는 랜덤액세스채널 설정 정보를 이용하여 랜덤액세스 프리엠블을 전송하며, SCell 1에 설정된 랜덤액세스채널로 랜덤 액세스 프리앰블을 전송하였으므로, 이후 수신하는 STAG1을 위한 TA 정보는 상기 랜덤액세스 프리엠블을 전송한 SCell 1 다운링크 타이밍에 적용하여 SCell 1의 업링크 전송 뿐만 아니라 SCell 2 업링크 전송 타이밍을 조정한다. If the base station subsequently instructs the terminal to transmit a random access preamble on the random access channel of the SCell 1, the terminal transmits a random access preamble using the random access channel configuration information included in the SCell 1, the SCell 1 Since the random access preamble is transmitted through the configured random access channel, the TA information for the received STAG1 is applied to the SCell 1 downlink timing of transmitting the random access preamble as well as the uplink transmission of the SCell 1 and the SCell 2 uplink transmission. Adjust the timing.

즉, 한 STAG에 포함되어 있는 SCell들 (위의 예에서 SCell 1과 SCell 2)에 대한 업링크 타이밍을 조절하기 위한 기준 다운링크 타이밍은 랜덤액세스채널 구성정보를 가지고 랜덤액세스를 수행한 SCell 1의 다운링크 타이밍으로 설정한다. 상기 RRC 계층의 메시지를 수신한 단말은 RRC 계층 확인 메시지를 전송한다 (613). 상기 RRC 계층 확인 메시지는 RRCConnectionReconfigurationComplete 메시지를 사용할 수 있다.That is, the reference downlink timing for adjusting the uplink timing for the SCells (SCell 1 and SCell 2 in the above example) included in one STAG is the value of SCell 1 that performs random access with random access channel configuration information. Set to downlink timing. Upon receipt of the RRC layer message, the UE transmits an RRC layer confirmation message (613). The RRC layer confirmation message may use an RRCConnectionReconfigurationComplete message.

이후, 기지국은 추가한 SCell 1, 2들을 활성화 시키기 위해 Activation/deactivation MAC Control Element (이하 Activation/deactivation MAC CE라 칭함)을 전송한다 (615). 또한, 기지국은 PDCCH order 를 전송하여, 상기 단말로 하여금 특정 셀 (본 예시도면에서는 SCell 1에 해당)에서 랜덤 엑세스 프리앰블을 전송하도록 명령한다 (617).Thereafter, the base station transmits an Activation / deactivation MAC Control Element (hereinafter referred to as Activation / deactivation MAC CE) to activate the added SCells 1 and 2 (615). In addition, the base station transmits a PDCCH order, and instructs the terminal to transmit a random access preamble in a specific cell (corresponding to SCell 1 in this example) (617).

이를 수신한 단말은 명령 받은 셀 (본 예시도면에서는 SCell 1에 해당)로 랜덤 엑세스 프리앰블을 전송한다 (619). 이를 수신한 기지국은 상기 랜덤액세스채널이 설정되어 있어 랜덤 액세스 프리엠블을 단말기로부터 수신한 셀 (본 예시도면에서는 SCell 1에 해당)의 하향링크신호를 기준으로 하여 타이밍 어드밴스 (Timing Advance, 이하 TA라 칭함) 정보를 포함하는 본 발명에서 제안하는 랜덤 액세스 응답 (Random Acess Response, 이하 RAR이라 칭함)를 전송한다 (621). Upon receiving this, the UE transmits a random access preamble to the commanded cell (corresponding to SCell 1 in this example) (619). The base station that receives the random access channel is set to a timing advance based on a downlink signal of a cell (corresponding to SCell 1 in this example) that receives a random access preamble from the terminal. A random access response (hereinafter referred to as RAR) proposed by the present invention including information) is transmitted (621).

상기 RAR 메시지에는 TAG 식별자 (TAG identifier, 이하 TAG ID라 칭함)를 포함하여, 어떠한 TAG에 대한 상향링크 타이밍을 조절해야하는 지에 대한 정보가 포함될 수 있으며, 혹은 복수 개의 TAG의 각각의 TA 정보가 포함이 될 수도 있다. 상세한 포맷은 도 9에서 설명하도록 한다. 상기 RAR 메시지를 수신한 단말은 TAG ID와 TA 정보, 혹은 복수개의 TAG ID 별 TA 정보를 확인하여, 해당 TAG ID에 속한 셀들의 상향링크 전송의 타이밍 정보를 조절한다 (623).The RAR message may include a TAG identifier (hereinafter referred to as a TAG ID), and may include information on which TAG to adjust uplink timing for, or includes TA information of each of a plurality of TAGs. May be The detailed format will be described with reference to FIG. 9. Upon receiving the RAR message, the UE checks TAG ID and TA information or TA information for each TAG ID, and adjusts timing information of uplink transmission of cells belonging to the corresponding TAG ID (623).

또한, 이후, (617, 619, 621) 단계와 같이 기지국이 추가적으로 단말에게 프리앰블 전송을 명령하여, 단말이 프리앰블을 전송할 경우에, 본 발명에서 제안하는 새로운 상기 프리앰블에 대한 응답 메시지 (RAR)를 통해, 혹은 본 발명에서 제안하는 새로운 TAC MAC CE 메시지를 통해 기지국은 특정 TAG에 속한 셀들의 상향링크 전송을 위한 타이밍, 혹은 복수 개의 TAG에 속한 각각의 셀들의 상향링크 타이밍을 조절할 수 있다. In addition, in step 617, 619, and 621, when the base station additionally instructs the UE to transmit the preamble, and the UE transmits the preamble, through a new response message (RAR) for the new preamble proposed by the present invention. Or, through the new TAC MAC CE message proposed in the present invention, the base station can adjust the timing for uplink transmission of cells belonging to a specific TAG, or the uplink timing of each cell belonging to a plurality of TAGs.

즉, 본 예시 도면에서 PTAG과 STAG 1이 있는데, 본 발명에서 제안하는 새로운 RAR 메시지에서 TAG ID (PTAG 혹은 STAG 1)를 포함시키거나, 혹은 TAC MAC CE 메시지에서 TAG ID (PTAG 혹은 STAG 1)을 포함시켜 해당 TAG에 속한 셀들의 상향링크 전송을 위한 타이밍을 조절할 수 있다. 상기 새로운 TAC MAC CE 메시지에 대한 상세 포맷은 도 9에서 설명하도록 한다.That is, in this example figure, there are PTAG and STAG 1, including a TAG ID (PTAG or STAG 1) in the new RAR message proposed in the present invention, or TAG ID (PTAG or STAG 1) in the TAC MAC CE message It can be included to adjust the timing for uplink transmission of the cells belonging to the TAG. A detailed format for the new TAC MAC CE message will be described with reference to FIG. 9.

도 7은 본 발명을 적용하였을 때의 단말기 동작 순서 도면이다.7 is a flowchart illustrating the operation of the terminal when the present invention is applied.

도 7에서, 기지국이 단말기에게 반송파 집적 관련 메시지를 전송하여 단말기가 사용할 수 있는 반송파에 대한 정보 및 어떠한 반송파 끼리 같은 타이밍 어드밴스를 사용할 수 있는지에 대한 반송파 그룹 정보 등을 설정한다 (703). 이후 기지국으로부터 특정 셀의 활성화 명령을 수신한다 (704). 이 때, 사용되는 메시지로 Activation/deactivation MAC CE 메시지가 사용된다. 이후, 기지국은 특정 셀 (PCell 혹은 SCell)로 프리앰블을 전송하라고 명령하는 PDCCH order 를 전송한다 (705). 단말은 (705) 단계에서 지시받은 셀로 랜덤 엑세스 프리앰블을 전송한다 (707).In FIG. 7, the base station transmits a carrier aggregation related message to the terminal to set information on carriers that can be used by the terminal and carrier group information on which carriers can use the same timing advance with each other (703). Thereafter, an activation command of a specific cell is received from the base station (704). At this time, the Activation / deactivation MAC CE message is used as the message used. Thereafter, the base station transmits a PDCCH order instructing to transmit a preamble to a specific cell (PCell or SCell) (705). The terminal transmits a random access preamble to the cell indicated in step 705 (707).

이후, 기지국으로부터 랜덤 엑세스 프리앰블에 대한 응답 메시지 (RAR 메시지)를 수신한다 (709). 본 발명에서는, 같은 시점에 다른 셀을 통해 같은 랜덤 엑세스 프리앰블을 전송한 경우, 이를 구분하기 위해 본 실시예에서 상기 RAR 메시지에는 TAG ID가 포함이 된 신규 메시지를 제안하였으며, 이를 사용하여 기지국은 상기 TAG ID가 가르키는 TAG에 속한 셀의 상향링크의 타이밍을 조절하라고 명령한다.Thereafter, a response message (RAR message) for a random access preamble is received from the base station (709). In the present invention, when the same random access preamble is transmitted through different cells at the same time, in this embodiment, a new message including a TAG ID is included in the RAR message in this embodiment. Commands to adjust the timing of the uplink of the cell belonging to the TAG indicated by the TAG ID.

즉, 예를 들어, 도 6에서의 예시도면에서 SCell 1에서 프리앰블 N 번이 전송되고, 똑 같은 시점에서 PCell의 상향링크로 프리앰블 N 번이 전송된 경우, RAR 메시지가 PCell을 통해서 전송이 되면, RAR 메시지가 SCell 1에서 전송된 프리앰블 N 번에 대한 것인지, PCell에서 전송된 프리앰블 N 번에 대한 것인지 모호함이 발생한다. 이를 위해, 본 발명에서는 RAR 메시지에 TAG ID (상기 예시에서 PTAG 혹은 STAG 1)에 대한 정보를 추가한다. 즉, 상기 예시에서 RAR 정보에 타이밍 어드밴스 정보와 함꼐 TAG ID로 STAG 1을 가르키면, STAG 1의 반송파들에 대해 상기 RAR 정보의 타이밍 어드밴스 정보를 적용하여, SCell 1의 하향링크를 기준으로 상향링크 타이밍을 조절한다. That is, for example, when the preamble N times are transmitted in SCell 1 in the example diagram in FIG. 6, and the preamble N times are transmitted in the uplink of the PCell at the same time, when the RAR message is transmitted through the PCell, Ambiguity occurs whether the RAR message is for N preambles transmitted from SCell 1 or N for preambles transmitted from PCell. To this end, in the present invention, the information on the TAG ID (PTAG or STAG 1 in the above example) is added to the RAR message. That is, in the above example, when STAG 1 is indicated by the TAG ID together with the timing advance information in the RAR information, the timing advance information of the RAR information is applied to the carriers of the STAG 1, and uplink based on the downlink of the SCell 1. Adjust the timing.

한편, 본 실시예에서는 생략하였으나, RAR의 또다른 실시예로 상기 RAR 메시지에 별도의 TAG ID 없이 복수 개의 TA 정보가 포함되는 경우도 있으며, 이 경우는 RAR 메시지의 각 TA 정보에 따라 각 TAG 에 해당하는 셀의 상향링크 타이밍을 조절하라고 명령한다. 즉, 기지국이 각 TAG 별로 상대적인 상향링크 타이밍 정보를 알 수 있다는 가정하에, 상기 RAR 메시지에, TAG 식별자를 별도로 추가하지 않고, 각 TAG 별 타이밍 어드밴스 정보를 모두 포함하여 전송하여 단말로 하여금 각 TAG의 TA 정보를 전송하여 각 TAG에 해당하는 셀의 상향링크 타이밍을 조절하라고 명령하는 것을 제안한다. Meanwhile, although omitted in the present embodiment, as another embodiment of the RAR, a plurality of TA information may be included in the RAR message without a separate TAG ID. In this case, each TA is included according to the TA information of the RAR message. Command to adjust the uplink timing of the corresponding cell. That is, under the assumption that the base station can know the relative uplink timing information for each TAG, the terminal transmits all the timing advance information for each TAG without additionally adding a TAG identifier to the RAR message and causes the terminal to transmit each TAG. It is proposed to command to adjust the uplink timing of a cell corresponding to each TAG by transmitting TA information.

예를 들어, 상기 예시에 그룹 1과 그룹 2가 있고, 그룹 1과 그룹 2의 타이밍 어드밴스 차이 Δ를 기지국이 이미 알고 있는 경우, 그룹 2로부터 프리앰블이 수신되었을 때, RAR 메시지에 타이밍 어드밴스 정보로, 그룹 1에 대한 타이밍 어드밴스 정보 (예를 들어, TA2-Δ), 그룹 2에 대한 타이밍 어드밴스 정보 (예를 들어, TA2)를 모두 전송하는 방안이다.For example, in the above example, if there is a group 1 and a group 2, and the base station already knows the timing advance difference Δ between the group 1 and the group 2, when the preamble is received from the group 2, the RAR message is used as timing advance information. It is a method of transmitting both timing advance information (for example, TA2-Δ) for group 1 and timing advance information (for example, TA2) for group 2.

상기 RAR 을 수신한 단말은, 상기 (707) 단계에서 랜덤 엑세스 프리앰블을 전송한 셀의 하향링크를 기준으로 설정하여, (709) 단계의 RAR 에 지시받은 TAG에 속한 셀들의 상향링크의 전송 타이밍을 설정하는 방법을 제안한다. Upon receiving the RAR, the UE sets the downlink transmission timing of the cells belonging to the TAG indicated by the RAR in step 709 by setting the downlink of the cell in which the random access preamble is transmitted in step 707. Suggest how to set up.

즉, 상기 도 6의 예시도면에서 STAG 1의 경우, SCell 1과 SCell 2 가운데 기지국이 랜덤 엑세스를 위한 랜덤 액세스 채널 (Random Access Channel, 이하 RACH라 칭함) 구성정보가 설정되어 있는 하향링크 셀 중 하나를 선택하여 (도 6의 예시도면에서는 SCell 1에 해당), SCell 1의 랜덤액세스채널을 통해 랜덤액세스 프리엠블 전송을 단말기에게 명령할 수 있다. That is, in the exemplary diagram of FIG. 6, in case of STAG 1, one of downlink cells in which a base station among SCell 1 and SCell 2 is configured with a random access channel (hereinafter referred to as RACH) configuration information for random access is configured. By selecting (corresponding to SCell 1 in the example diagram of FIG. 6), the UE may command a random access preamble transmission through the random access channel of SCell 1.

이후 상기 단말기는 상기 SCell 1에 포함되어 있는 랜덤액세스채널 설정 정보를 이용하여 랜덤액세스 프리엠블을 전송하며, SCell 1에 설정된 랜덤액세스채널로 랜덤 액세스 프리앰블을 전송하였으므로, 이 후 수신하는 STAG1을 위한 TA 정보는 상기 랜덤액세스 프리엠블을 전송한 SCell 1 다운링크 타이밍에 적용하여 SCell 1의 업링크 전송 뿐만 아니라 SCell 2 업링크 전송 타이밍을 조정한다. Thereafter, the terminal transmits a random access preamble using the random access channel configuration information included in the SCell 1, and transmits a random access preamble to the random access channel set in the SCell 1, and thus, TA for the STAG1 received thereafter. The information is applied to the SCell 1 downlink timing of transmitting the random access preamble to adjust the SCell 2 uplink transmission timing as well as the uplink transmission of SCell 1.

즉, 한 STAG에 포함되어 있는 SCell들 (도 6의 SCell 1과 SCell 2)에 대한 업링크 타이밍을 조절하기 위한 기준 다운링크 타이밍은 랜덤액세스채널 구성정보를 가지고 랜덤액세스를 수행한 SCell 1의 다운링크 타이밍으로 설정하고 상향링크 타이밍을 설정하는 방법을 제안한다.That is, the reference downlink timing for adjusting the uplink timing for the SCells (SCell 1 and SCell 2 in FIG. 6) included in one STAG is down of SCell 1 which has performed random access with random access channel configuration information. A method for setting up link timing and uplink timing is proposed.

이후, 단말은 해당 TAG에 대해 TAT를 시작하고 (713), 상향링크 동기를 맞춘 TAG에 속한 셀들에서 상향링크 데이터 전송을 수행한다 (715).Thereafter, the UE starts the TAT for the corresponding TAG (713), and performs uplink data transmission in cells belonging to the TAG with uplink synchronization (715).

이후, 해당 TAG에 대한 RAR 혹은 TAC MAC CE를 수신한 경우 (717), (711) 단계와 동일하게, 해당 TAG에서 RACH가 설정된 SCell들 가운데 가장 최근에 프리앰블 전송을 성공한 셀의 하향링크를 기준셀로 설정하여, 상기 RAR 혹은 TAC MAC CE에 포함된 TA 정보를 활용하여, 상기 하향링크 기준셀을 기준으로 TAG에 속한 셀들에 대해 상향링크 타이밍 정보를 조정한다 (719). 조정 한 이후, 해당 TAG에 대한 TAT를 재시작 하고 (713), 해당 셀들에서의 상향링크 데이터 전송을 수행한다 (715).Subsequently, when receiving the RAR or TAC MAC CE for the corresponding TAG (step 717), as in step 711, the reference cell refers to the downlink of the cell in which the preamble transmission is most recently performed among the SCells in which the RACH is configured in the corresponding TAG. In step 719, uplink timing information is adjusted for cells belonging to a TAG based on the downlink reference cell by using TA information included in the RAR or TAC MAC CE. After the adjustment, the TAT for the corresponding TAG is restarted (713), and uplink data transmission is performed in the corresponding cells (715).

만약, 해당 TAG에 대한 RAR 혹은 TAC MAC CE를 수신하지 못한 경우, 해당 TAG의 TAT 가 만료되었는지를 확인하고, 만약 만료된 경우는 해당 TAG에 대한 동작을 종료하고 (723), 만료되지 않은 경우에는 계속해서 해당 셀들에서의 상향링크 데이터 전송을 수행한다 (715).If the RAR or the TAC MAC CE for the TAG is not received, the TAT of the TAG has been expired. If it has expired, the operation for the TAG is terminated (723). Subsequently, uplink data transmission in corresponding cells is performed (715).

도 8은 본 발명을 적용하였을 때의 기지국 동작 순서 도면이다.8 is a flowchart illustrating the operation of a base station when the present invention is applied.

기지국은 반송파 집적이 가능한 단말에게 SCell 들을, RACH 설정 정보를 포함하는 STAG 정보와 함께, 설정한다 (803). 이후, 설정한 SCell 들을 활성화 시키기 위해 Activation/deactivation MAC CE를 통해 특정 STAG에 속해있는 SCell의 활성화 명령을 하고 (805), 상기 활성화 한 SCell의 상향링크 타이밍 조절을 위해, 상기 단말로 하여금 프리앰블을 전송하도록 PDCCH order 전송하여 명령한다 (807).The base station configures SCells together with STAG information including RACH configuration information to a terminal capable of carrier aggregation (803). Subsequently, an activation command of a SCell belonging to a specific STAG is made through Activation / deactivation MAC CE to activate the configured SCells (805), and the UE transmits a preamble for adjusting uplink timing of the activated SCell. The PDCCH order is transmitted and then instructed (807).

상기 명령에 따라 상기 단말이 프리앰블을 전송하면 기지국은 해당 프리앰블을 수신하여, 도 6, 도 7에서 설명한 방법에 따라 선택한 하향링크 셀 신호를 기준으로 TA 정보를 생성하여, 상기 TA 정보를 포함한 RAR 메시지를 전송한다 (809). 이 때, RAR 메시지에는 상기 활성화 한 SCell이 속한 STAG의 ID를 포함해서 전송할 수도 있고, 혹은 상기 STAG를 포함한, 다른 STAG 및 PTAG의 TA 정보를 모두 포함하여 전송할 수도 있다. 이후, 해당 단말의 해당 TAG로 상향링크 자원 할당을 하고 데이터 수신을 한다 (811). When the terminal transmits the preamble according to the command, the base station receives the preamble, generates TA information based on the downlink cell signal selected according to the method described with reference to FIGS. 6 and 7, and then generates an RAR message including the TA information. Send 809. In this case, the RAR message may be transmitted including the ID of the STAG to which the activated SCell belongs, or may be transmitted including all TA information of other STAGs and PTAGs including the STAG. Thereafter, uplink resource allocation is performed to the corresponding TAG of the terminal and data is received (811).

이후, 기지국이 상기 활성화한 SCell로 부터 오는 신호의 타이밍을 추가적으로 조정이 필요하다고 판단 되는 경우 (813), PDCCH order를 다시 해당 단말에게 전송하여 RAR 메시지를 전송하거나, 혹은 TAC MAC CE 메시지를 사용하여 조정한다 (815). 상기 TAC MAC CE에는 본 발명에서 제안하는 상기 RAR과 마찬가지로 TAG ID와 TA 정보를 포함하여 특정 TAG에 대해서 상향링크 타이밍을 수정할 수 있다.Then, when it is determined that the base station additionally needs to adjust the timing of the signal from the activated SCell (813), the PDCCH order is transmitted to the terminal again to transmit a RAR message, or using a TAC MAC CE message Adjust (815). Like the RAR proposed by the present invention, the TAC MAC CE can modify uplink timing for a specific TAG including TAG ID and TA information.

도 9는 제안하는 RAR과 TAC MAC CE 포맷 도면이다.9 is a diagram of a proposed RAR and TAC MAC CE format.

도 9a은 기존에 정의되어 있는 RAR 포맷이다. 본 포맷에서 기지국은 RAR 메시지를 통해 Timing Advance Command로 상향링크 타이밍을 조절하며 (11 비트), UL grant로 RAR 이후 메시지의 할당 위치를 설정하며 (20 비트), Temporary C-RNTI로 해당 셀에 처음 접속하는 단말에게 식별자를 할당할 수 있다 (16 비트).9A is a RAR format defined previously. In this format, the base station adjusts the uplink timing with the Timing Advance Command through the RAR message (11 bits), sets the allocation position of the message after the RAR with the UL grant (20 bits), and sets the first time in the cell with the Temporary C-RNTI. An identifier may be allocated to the accessing terminal (16 bits).

도 9b은 본 발명에서 제안하는 RAR 포맷의 실시예 1이다. 본 실시예에서 기존의 RAR 포맷에서 예비로 남겨둔 R 필드 대신 TAG ID 라는 필드를 새로 도입하여, 해당 비트가 0이면 PTAG, 1이면 STAG 1에 해당함을 알려준다.9B shows Embodiment 1 of the RAR format proposed by the present invention. In the present embodiment, a new field called TAG ID is introduced instead of the R field reserved in the existing RAR format, indicating that the corresponding bit corresponds to PTAG and 0 to STAG 1.

도 9c는 본 발명에서 제안하는 RAR 포맷의 실시예 2이다. 본 실시예에서 RAR 포맷에는 Flag 라는 필드가 있어서, 0일 경우에는 기존의 RAR 포맷 (도 9-0)을 그대로 사용하지만, 1일 경우에는 최대 4개까지의 TAG에 대한 TA 정보를 전송한다.9C is Embodiment 2 of the RAR format proposed by the present invention. In the present embodiment, the RAR format has a field called Flag. If 0, the existing RAR format (FIG. 9-0) is used as it is, but if 1, TA information for up to 4 TAGs is transmitted.

도 9d은 기존에 규격에 정의되어 있는 TAC MAC CE의 포맷이다. 이 경우 6비트의 Timing Advance Command로 상향링크 타이밍을 조절을 명령한다.9D is a format of TAC MAC CE, which is defined in a standard. In this case, the 6-bit Timing Advance Command commands the uplink timing adjustment.

도 9e는 본 발명에서 제안하는 TAC MAC CE의 포맷의 실시예 1이다. 본 실시예에서 기존의 TAC MAC CE의 포맷에서 예비로 남겨둔 2 비트의 R 필드 대신 TAG ID를 도입하여, 00인 경우 PTAG, 01인 경우 STAG 1, 10인 경우 STAG2, 11인 경우 STAG 3을 가르켜, 해당 TAG ID가 가르키는 TAG에 대해 상향링크 타이밍을 조절하도록 한다.FIG. 9E shows Embodiment 1 of a format of TAC MAC CE proposed in the present invention. FIG. In this embodiment, the TAG ID is introduced instead of the 2-bit R field reserved in the conventional TAC MAC CE format, so that PTAG is 00, STAG 1 is 10, STAG 2 is 10, and STAG 3 is 11, respectively. In this case, the uplink timing of the TAG indicated by the corresponding TAG ID is adjusted.

도 10은 본 발명을 적용한 단말의 장치도면이다. 단말은 상위 계층 (1005)과 데이터 등을 송수신하며, 제어 메시지 처리부 (1007)를 통해 제어 메시지들을 송수신하며, 송신 시, 제어부 (1009)의 제어에 따라 다중화 장치 (1003)을 통해 다중화 후 송신기를 통해 데이터를 전송하며 (1001), 수신 시, 제어부 (1009)의 제어에 따라 수신기로 물리신호를 수신한 다음 (1001), 역다중화 장치 (1003)으로 수신 신호를 역다중화하고, 각각 메시지 정보에 따라 상위 계층 (1005) 혹은 제어메시지 처리부 (1007)로 전달해준다.10 is a device diagram of a terminal to which the present invention is applied. The terminal transmits and receives data with the upper layer 1005, transmits and receives control messages through the control message processing unit 1007, and, upon transmission, transmits the transmitter after multiplexing through the multiplexing device 1003 under the control of the control unit 1009. In operation 1001, when receiving, a physical signal is received by a receiver under the control of the controller 1009, and then demultiplexed by the demultiplexer 1003, respectively, and the message information is decoded. Therefore, the information is transmitted to the upper layer 1005 or the control message processor 1007.

본 발명에서 RRC 계층 메시지로 반송파 집적 관련 설정 메시지를 제어 메시지 처리부 (1007)가 수신하면, 반송파 집적 동작 처리부 (1011)가 상기 도 6에서 설명한 방법 가운데 하나로 어떠한 셀을 하향링크 타이밍 기준 셀로 선정할지를 정한다. 이후, 기지국으로부터 프리앰블 전송 명령을 받으면, 제어부 (1009)가 프리앰블 전송을 수행을 명령하고, 이후 상기 도 6에서 제안한 방법으로 만들어진 RAR 메시지 (도 9 참조)를 수신하여, RAR에 TAG ID와 TA가 포함된 경우, 해당 TAG ID에 해당하는 TAG의 상향링크 타이밍을 조절하고, 복수 개의 TA 정보가 포함된 경우, 해당 TAG의 상향링크 타이밍 정보를 각각 한꺼번에 조절한다. 마찬가지로 기지국으로부터 TAC MAC CE를 수신하는 경우에도 TAC MAC CE에 포함된 정보에 따라 해당 TAG 의 상향링크 타이밍을 조절하도록 한다.In the present invention, when the control message processing unit 1007 receives a carrier aggregation setup message as an RRC layer message, the carrier integration operation processor 1011 determines which cell is to be selected as a downlink timing reference cell using one of the methods described with reference to FIG. . Subsequently, when receiving a preamble transmission command from the base station, the control unit 1009 commands to perform the preamble transmission, and then receives the RAR message (see FIG. 9) generated by the method proposed in FIG. When included, the uplink timing of the TAG corresponding to the TAG ID is adjusted, and when a plurality of TA information is included, the uplink timing information of the TAG is adjusted at a time. Similarly, even when receiving a TAC MAC CE from the base station to adjust the uplink timing of the corresponding TAG according to the information contained in the TAC MAC CE.

도 11은 본 발명을 적용한 기지국의 장치도면이다. 단말은 상위 계층 (1105)과 데이터 등을 송수신하며, 제어 메시지 처리부 (1107)를 통해 제어 메시지들을 송수신하며, 송신 시, 제어부 (1109)의 제어에 따라 다중화 장치 (1103)을 통해 다중화 후 송신기를 통해 데이터를 전송하며 (1101), 수신 시, 제어부 (1109)의 제어에 따라 수신기로 물리신호를 수신한 다음 (1101), 역다중화 장치 (1103)으로 수신 신호를 역다중화하고, 각각 메시지 정보에 따라 상위 계층 (1105) 혹은 제어메시지 처리부 (1107)로 전달해준다.11 is a device diagram of a base station to which the present invention is applied. The terminal transmits and receives data with the upper layer 1105, transmits and receives control messages through the control message processing unit 1107, and, upon transmission, transmits the transmitter after multiplexing through the multiplexing device 1103 under the control of the control unit 1109. In operation 1101, upon reception, a physical signal is received by the receiver under the control of the controller 1109, and then demultiplexed by the demultiplexer 1103, respectively. Therefore, the information is transmitted to the upper layer 1105 or the control message processor 1107.

본 발명에서 반송파 집적 동작 처리부 (1111)가 특정 단말에게 특정 SCell 및 STAG를 설정하기 위해 RRC 계층 메시지로 반송파 집적 관련 설정 메시지를 제어 메시지 처리부 (1107)가 생성하여 전송한다. 또한 이후, 상기 특정 SCell을 활성화 하기 위해 Activation/deactivation MAC CE를 생성하여 전송하고, 상기 단말에게 해당 SCell에 대한 상향링크 동기를 맞추기 위해 PDCCH order를 전송하여 프리앰블 전송을 명령한다. In the present invention, the carrier aggregation operation processor 1111 generates and transmits a carrier aggregation related configuration message as an RRC layer message in order to configure a specific SCell and STAG to a specific terminal. Further, after activating / deactivation MAC CE is generated and activated to activate the specific SCell, the UE transmits a PDCCH order to synchronize uplink with respect to the corresponding SCell, thereby instructing preamble transmission.

이후, 명령한 프리앰블을 수신하면, 상기 도 6에서 제안한 방법 가운데 한 가지 방법으로 하향링크 기준 신호를 정하여, 이를 기준으로 TA 정보를 생성하여, 상기 TA 정보를 포함한 RAR 메시지 (도 9 참조)를 생성, 전송한다. 또한 기지국이 상기 단말이 추가적인 상향링크 타이밍 조절이 필요하다고 판단되는 경우, 본 발명에서 제안하는 TAC MAC CE를 생성하여 상기 단말에게 전송하여, 상기 단말로 하여금 해당 TAG 의 상향링크 타이밍을 조절하도록 한다.Subsequently, upon receiving the commanded preamble, a downlink reference signal is determined by one of the methods proposed in FIG. 6, and TA information is generated based on the downlink reference signal. , send. In addition, when the base station determines that the terminal needs additional uplink timing adjustment, the base station generates a TAC MAC CE proposed by the present invention and transmits it to the terminal, thereby allowing the terminal to adjust the uplink timing of the corresponding TAG.

제안하는 방식을 사용하면, 반송파 집적 기술을 사용하는 경우에 복수 개의 상향링크 타이밍을 관리하는 시스템에서 하향링크 타이밍 기준 셀을 명확히 정의하여 단말 동작의 오동작을 막을 수 있으며, 상향링크 타이밍 조정 명령이 특정 TAG에 해당하는 정보임을 확인하여 동작함으로써 정확한 동작을 수행할 수 있다.Using the proposed scheme, in case of using carrier aggregation technology, a downlink timing reference cell can be clearly defined in a system managing a plurality of uplink timings to prevent a malfunction of a terminal operation. By confirming that the information corresponds to the TAG, the correct operation can be performed.

본 발명의 상세한 설명에서는 구체적인 실시예에 관해 설명하였으나, 본 발명의 범위에서 벗어나지 않는 한도 내에서 여러 가지 변형이 가능함은 물론이다. 그러므로 본 발명의 범위는 설명된 실시예에 국한되지 않으며, 후술되는 특허청구의 범위뿐만 아니라 이 특허청구의 범위와 균등한 것들에 의해 정해져야 한다.In the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims, and equivalents thereof.

125 : MME
130: S-GW
105. 110, 115, 120 : ENB
135 : UE
1001 : 단말의 송수신기
1003 : 단말의 다중화 및 역다중화 장치
1005 : 단말의 상위계층 장치
1007 : 단말의 제어 메세지 처리부
1009 : 단말의 제어부
1011 : 단말의 반송파 집적동작 처리부의 반송파 집적동작 처리부
1101 : 기지국의 송수신기
1103 : 기지국의 다중화 및 역다중화 장치
1105 : 기지국의 상위계층 장치
1107 : 기지국의 제어 메세지 처리부
1109 : 기지국의 제어부
1111 : 기지국의 반송파 집적동작 처리부125: MME
130: S-GW
105. 110, 115, 120: ENB
135: UE
1001: transceiver of the terminal
1003: terminal multiplexing and demultiplexing apparatus
1005: higher layer device of the terminal
1007: control message processing unit of the terminal
1009: control unit of the terminal
1011: carrier aggregation operation processing unit of the carrier aggregation operation processing unit of the terminal
1101: transceiver of base station
1103: multiplexing and demultiplexing apparatus of a base station
1105: upper layer device of the base station
1107: control message processing unit of the base station
1109: control unit of the base station
1111: carrier integrated operation processor of base station

Claims (16)

적어도 하나 이상의 반송파 결합을 지원하는 무선통신 시스템에서, 단말의 타이밍 조절 방법에 있어서,
기지국에 랜덤 엑세스 프리앰블을 전송하는 단계; 및
상향링크 타이밍 조절을 명령하는 타이밍 어드밴스 커멘드(Timing Advance Command, TAC)를 포함하는 랜덤 엑세스 응답 메시지를 상기 기지국으로부터 수신하는 단계를 포함하며,
상기 랜덤 엑세스 응답 메시지는, 상기 타이밍 어드밴스 커멘드를 적용할 타이밍 어드밴스 그룹 정보(Timing Advance Group, TAG)를 더 포함하는 것을 특징으로 하는 타이밍 조절 방법. In the wireless communication system supporting at least one or more carrier combinations, in the timing adjustment method of the terminal,
Transmitting a random access preamble to the base station; And
Receiving a random access response message from the base station including a timing advance command (TAC) for commanding uplink timing adjustment;
The random access response message further includes timing advance group information (Timing Advance Group, TAG) to which the timing advance command is applied. 제 1항에 있어서, 상기 랜덤 엑세스 응답 메시지는,
상기 타이밍 어드밴스 그룹 정보를 적어도 하나 이상 포함하며, 각각의 타이밍 어드밴스 그룹에 대한 상기 타이밍 어드밴스 커멘드를 포함하는 것을 특징으로 하는 타이밍 조절 방법. The method of claim 1, wherein the random access response message,
And at least one of the timing advance group information, and the timing advance command for each timing advance group. 제 2항에 있어서, 상기 랜덤 엑세스 응답 메시지 수신 단계 이후에,
상기 타이밍 어드밴스 그룹에 속하는 적어도 하나 이상의 반송파에 대해, 상기 타이밍 어드밴스 커멘드를 적용하여 상향링크 타이밍을 조절하는 단계를 더 포함하는 것을 특징으로 하는 타이밍 조절 방법. The method of claim 2, wherein after receiving the random access response message,
And adjusting the uplink timing by applying the timing advance command to at least one carrier belonging to the timing advance group. 제 3항에 있어서, 상기 랜덤 엑세스 응답 메시지 수신 단계 이후에,
별도의 타이밍 어드밴스 커멘드 및 상기 타이밍 어드밴스 커멘드를 적용할 타이밍 어드밴스 그룹정보를 포함하는 타이밍 조절 제어신호(Timing Advance Command MAC Control Element, TAC MAC CE)를 상기 기지국으로부터 수신한 경우, 상기 타이밍 어드밴스 그룹에 속하는 적어도 하나 이상의 반송파에 대해, 상기 타이밍 어드밴스 커멘드를 적용하여 상향링크 타이밍을 조절하는 단계를 더 포함하는 것을 특징으로 하는 타이밍 조절 방법. The method of claim 3, wherein after receiving the random access response message,
When a timing adjustment control signal (Timing Advance Command MAC Control Element, TAC MAC CE) including a separate timing advance command and timing advance group information to which the timing advance command is applied is received from the base station, it belongs to the timing advance group. And adjusting the uplink timing by applying the timing advance command to at least one or more carriers. 제 1항에 있어서, 상기 랜덤 엑세스 프리앰블을 전송하는 단계 이전에,
상기 단말이 가장 마지막으로 상기 랜덤 엑세스 프리앰블 전송에 성공한 반송파 또는 상기 랜덤 엑세스 프리앰블 전송을 위한 채널 정보가 설정된 반송파를 기반으로 상기 프리엠블을 전송할 타이밍을 조절하는 단계를 더 포함하는 것을 특징으로 하는 타이밍 조절 방법. The method of claim 1, wherein before transmitting the random access preamble,
And adjusting, by the terminal, the timing of transmitting the preamble based on a carrier on which the random access preamble transmission was last transmitted or a carrier on which channel information for the random access preamble transmission is set. Way. 적어도 하나 이상의 반송파 결합을 지원하는 무선통신 시스템에서, 기지국의 타이밍 조절 방법에 있어서,
단말로부터 랜덤 엑세스 프리앰블을 수신하는 단계; 및
상향링크 타이밍 조절을 명령하는 타이밍 어드밴스 커멘드(Timing Advance Command, TAC)를 포함하는 랜덤 엑세스 응답 메시지를 상기 단말에게 전송하는 단계를 포함하며,
상기 랜덤 엑세스 응답 메시지는, 상기 타이밍 어드밴스 커멘드를 적용할 타이밍 어드밴스 그룹 정보(Timing Advance Group, TAG)를 더 포함하는 것을 특징으로 하는 타이밍 조절 방법. In a wireless communication system supporting at least one or more carrier combinations, in a timing adjustment method of a base station,
Receiving a random access preamble from a terminal; And
And transmitting a random access response message including a timing advance command (TAC) to command uplink timing adjustment to the terminal.
The random access response message further includes timing advance group information (Timing Advance Group, TAG) to which the timing advance command is applied. 제 6항에 있어서, 상기 랜덤 엑세스 응답 메시지는,
상기 타이밍 어드밴스 그룹 정보를 적어도 하나 이상 포함하며, 각각의 타이밍 어드밴스 그룹에 대한 상기 타이밍 어드밴스 커멘드를 포함하는 것을 특징으로 하는 타이밍 조절 방법. The method of claim 6, wherein the random access response message,
And at least one of the timing advance group information, and the timing advance command for each timing advance group. 제 7항에 있어서, 상기 랜덤 엑세스 응답 메시지 전송 단계 이후에,
상기 상향링크 타이밍의 추가 조절이 필요한 경우, 별도의 타이밍 어드밴스 커멘드(Timing Advance Comnnand, TAC) 및 상기 타이밍 어드밴스 커멘드를 적용할 타이밍 어드밴스 그룹정보를 포함하는 타이밍 조절 제어신호(Timing Advance Command MAC Control Element, TAC MAC CE)를 상기 단말에게 전송하는 단계를 더 포함하는 것을 특징으로 하는 타이밍 조절 방법. The method of claim 7, wherein after the step of transmitting the random access response message,
When further adjustment of the uplink timing is necessary, a timing adjustment control signal including a separate timing advance command (TAC) and timing advance group information to which the timing advance command is applied (Timing Advance Command MAC Control Element, TAC MAC CE) further comprising the step of transmitting to the terminal. 적어도 하나 이상의 반송파 결합을 지원하는 무선통신 시스템에서, 신호의 송수신 타이밍을 조절하는 단말에 있어서,
기지국과 신호를 송수신하는 송수신기; 및
기지국에 랜덤 엑세스 프리앰블을 전송하고, 상향링크 타이밍 조절을 명령하는 타이밍 어드밴스 커멘드(Timing Advance Command, TAC)를 포함하는 랜덤 엑세스 응답 메시지를 상기 기지국으로부터 수신하도록 제어하는 제어부를 포함하며,
상기 랜덤 엑세스 응답 메시지는, 상기 타이밍 어드밴스 커멘드를 적용할 타이밍 어드밴스 그룹 정보(Timing Advance Group, TAG)를 더 포함하는 것을 특징으로 하는 타이밍 조절 방법. In a wireless communication system supporting at least one carrier combination, the terminal for controlling the transmission and reception timing of a signal,
A transceiver for transmitting and receiving a signal with a base station; And
A control unit which transmits a random access preamble to the base station and controls to receive a random access response message including a timing advance command (TAC) for commanding uplink timing adjustment from the base station,
The random access response message further includes timing advance group information (Timing Advance Group, TAG) to which the timing advance command is applied. 제 9항에 있어서, 상기 랜덤 엑세스 응답 메시지는,
상기 타이밍 어드밴스 그룹 정보를 적어도 하나 이상 포함하며, 각각의 타이밍 어드밴스 그룹에 대한 상기 타이밍 어드밴스 커멘드를 포함하는 것을 특징으로 하는 단말. The method of claim 9, wherein the random access response message,
And at least one of the timing advance group information, and the timing advance command for each timing advance group. 제 10항에 있어서, 상기 제어부는,
상기 랜덤 엑세스 응답 메시지를 수신하면, 상기 타이밍 어드밴스 그룹에 속하는 적어도 하나 이상의 반송파에 대해, 상기 타이밍 어드밴스 커멘드를 적용하여 상향링크 타이밍을 조절하는 것을 특징으로 하는 단말.The method of claim 10, wherein the control unit,
And receiving the random access response message, adjusting uplink timing by applying the timing advance command to at least one carrier belonging to the timing advance group. 제 11항에 있어서, 상기 제어부는,
별도의 타이밍 어드밴스 커멘드 및 상기 타이밍 어드밴스 커멘드를 적용할 타이밍 어드밴스 그룹정보를 포함하는 타이밍 조절 제어신호(Timing Advance Command MAC Control Element, TAC MAC CE)를 수신하도록 제어하며, 상기 타이밍 조절 제어신호를 수신하면, 상기 타이밍 어드밴스 그룹에 속하는 적어도 하나 이상의 반송파에 대해, 상기 타이밍 어드밴스 커멘드를 적용하여 상향링크 타이밍을 조절하는 것을 특징으로 하는 단말.The method of claim 11, wherein the control unit,
Receives a timing adjustment control signal (Timing Advance Command MAC Control Element, TAC MAC CE) including a separate timing advance command and timing advance group information to which the timing advance command is applied, and when the timing adjustment control signal is received. And adjusting the uplink timing by applying the timing advance command to at least one carrier belonging to the timing advance group. 제 9항에 있어서, 상기 제어부는,
상기 단말이 가장 마지막으로 상기 랜덤 엑세스 프리앰블 전송에 성공한 반송파 또는 상기 랜덤 엑세스 프리앰블 전송을 위한 채널 정보가 설정된 반송파를 기반으로 상기 프리엠블을 전송할 타이밍을 조절하는 것을 특징으로 하는 단말.The method of claim 9, wherein the control unit,
And the terminal adjusts a timing of transmitting the preamble based on a carrier on which the random access preamble transmission was last transmitted or a carrier on which channel information for the random access preamble transmission is set. 적어도 하나 이상의 반송파 결합을 지원하는 무선통신 시스템에서, 신호의 송수신 타이밍을 조절하는 기지국에 있어서,
단말과 신호를 송수신하는 송수신기; 및
단말로부터 랜덤 엑세스 프리앰블을 수신하고, 상향링크 타이밍 조절을 명령하는 타이밍 어드밴스 커멘드(Timing Advance Command, TAC)를 포함하는 랜덤 엑세스 응답 메시지를 상기 단말에게 전송하도록 제어하는 제어부를 포함하며,
상기 랜덤 엑세스 응답 메시지는, 상기 타이밍 어드밴스 커멘드를 적용할 타이밍 어드밴스 그룹 정보(Timing Advance Group, TAG)를 더 포함하는 것을 특징으로 하는 기지국.In a wireless communication system supporting at least one carrier combination, the base station for adjusting the transmission and reception timing of a signal,
A transceiver for transmitting and receiving a signal with a terminal; And
A control unit configured to receive a random access preamble from the terminal and to transmit a random access response message including a timing advance command (TAC) for commanding uplink timing adjustment to the terminal;
The random access response message, the base station further comprises a timing advance group information (TAG) to apply the timing advance command. 제 14항에 있어서, 상기 랜덤 엑세스 응답 메시지는,
상기 타이밍 어드밴스 그룹 정보를 적어도 하나 이상 포함하며, 각각의 타이밍 어드밴스 그룹에 대한 상기 타이밍 어드밴스 커멘드를 포함하는 것을 특징으로 하는 기지국.The method of claim 14, wherein the random access response message,
And at least one of the timing advance group information, the timing advance command for each timing advance group. 제 15항에 있어서, 상기 제어부는,
상기 상향링크 타이밍의 추가 조절이 필요한 경우, 별도의 타이밍 어드밴스 커멘드(Timing Advance Comnnand, TAC) 및 상기 타이밍 어드밴스 커멘드를 적용하는 타이밍 어드밴스 그룹정보를 포함하는 타이밍 조절 제어신호(Timing Advance Command MAC Control Element, TAC MAC CE)를 상기 단말에게 전송하도록 제어하는 것을 특징으로 하는 기지국.
The method of claim 15, wherein the control unit,
When further adjustment of the uplink timing is required, a timing adjustment control signal including a separate timing advance command (TAC) and timing advance group information to which the timing advance command is applied (Timing Advance Command MAC Control Element, TAC MAC CE) to control the transmission to the terminal.
KR1020120035216A 2011-02-21 2012-04-05 Method and appratus of configuring donwlink timing reference and transmitting random access response in mobile communication system using carrier aggregation KR101974987B1 (en)

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